1 /* 2 * Driver for the i2c controller on the Marvell line of host bridges 3 * (e.g, gt642[46]0, mv643[46]0, mv644[46]0, and Orion SoC family). 4 * 5 * Author: Mark A. Greer <mgreer@mvista.com> 6 * 7 * 2005 (c) MontaVista, Software, Inc. This file is licensed under 8 * the terms of the GNU General Public License version 2. This program 9 * is licensed "as is" without any warranty of any kind, whether express 10 * or implied. 11 */ 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/spinlock.h> 15 #include <linux/i2c.h> 16 #include <linux/interrupt.h> 17 #include <linux/mv643xx_i2c.h> 18 #include <linux/platform_device.h> 19 20 #include <asm/io.h> 21 22 /* Register defines */ 23 #define MV64XXX_I2C_REG_SLAVE_ADDR 0x00 24 #define MV64XXX_I2C_REG_DATA 0x04 25 #define MV64XXX_I2C_REG_CONTROL 0x08 26 #define MV64XXX_I2C_REG_STATUS 0x0c 27 #define MV64XXX_I2C_REG_BAUD 0x0c 28 #define MV64XXX_I2C_REG_EXT_SLAVE_ADDR 0x10 29 #define MV64XXX_I2C_REG_SOFT_RESET 0x1c 30 31 #define MV64XXX_I2C_REG_CONTROL_ACK 0x00000004 32 #define MV64XXX_I2C_REG_CONTROL_IFLG 0x00000008 33 #define MV64XXX_I2C_REG_CONTROL_STOP 0x00000010 34 #define MV64XXX_I2C_REG_CONTROL_START 0x00000020 35 #define MV64XXX_I2C_REG_CONTROL_TWSIEN 0x00000040 36 #define MV64XXX_I2C_REG_CONTROL_INTEN 0x00000080 37 38 /* Ctlr status values */ 39 #define MV64XXX_I2C_STATUS_BUS_ERR 0x00 40 #define MV64XXX_I2C_STATUS_MAST_START 0x08 41 #define MV64XXX_I2C_STATUS_MAST_REPEAT_START 0x10 42 #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_ACK 0x18 43 #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_NO_ACK 0x20 44 #define MV64XXX_I2C_STATUS_MAST_WR_ACK 0x28 45 #define MV64XXX_I2C_STATUS_MAST_WR_NO_ACK 0x30 46 #define MV64XXX_I2C_STATUS_MAST_LOST_ARB 0x38 47 #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_ACK 0x40 48 #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_NO_ACK 0x48 49 #define MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK 0x50 50 #define MV64XXX_I2C_STATUS_MAST_RD_DATA_NO_ACK 0x58 51 #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_ACK 0xd0 52 #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_NO_ACK 0xd8 53 #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_ACK 0xe0 54 #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_NO_ACK 0xe8 55 #define MV64XXX_I2C_STATUS_NO_STATUS 0xf8 56 57 /* Driver states */ 58 enum { 59 MV64XXX_I2C_STATE_INVALID, 60 MV64XXX_I2C_STATE_IDLE, 61 MV64XXX_I2C_STATE_WAITING_FOR_START_COND, 62 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK, 63 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK, 64 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK, 65 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA, 66 }; 67 68 /* Driver actions */ 69 enum { 70 MV64XXX_I2C_ACTION_INVALID, 71 MV64XXX_I2C_ACTION_CONTINUE, 72 MV64XXX_I2C_ACTION_SEND_START, 73 MV64XXX_I2C_ACTION_SEND_ADDR_1, 74 MV64XXX_I2C_ACTION_SEND_ADDR_2, 75 MV64XXX_I2C_ACTION_SEND_DATA, 76 MV64XXX_I2C_ACTION_RCV_DATA, 77 MV64XXX_I2C_ACTION_RCV_DATA_STOP, 78 MV64XXX_I2C_ACTION_SEND_STOP, 79 }; 80 81 struct mv64xxx_i2c_data { 82 int irq; 83 u32 state; 84 u32 action; 85 u32 aborting; 86 u32 cntl_bits; 87 void __iomem *reg_base; 88 u32 reg_base_p; 89 u32 reg_size; 90 u32 addr1; 91 u32 addr2; 92 u32 bytes_left; 93 u32 byte_posn; 94 u32 block; 95 int rc; 96 u32 freq_m; 97 u32 freq_n; 98 wait_queue_head_t waitq; 99 spinlock_t lock; 100 struct i2c_msg *msg; 101 struct i2c_adapter adapter; 102 }; 103 104 /* 105 ***************************************************************************** 106 * 107 * Finite State Machine & Interrupt Routines 108 * 109 ***************************************************************************** 110 */ 111 112 /* Reset hardware and initialize FSM */ 113 static void 114 mv64xxx_i2c_hw_init(struct mv64xxx_i2c_data *drv_data) 115 { 116 writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SOFT_RESET); 117 writel((((drv_data->freq_m & 0xf) << 3) | (drv_data->freq_n & 0x7)), 118 drv_data->reg_base + MV64XXX_I2C_REG_BAUD); 119 writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SLAVE_ADDR); 120 writel(0, drv_data->reg_base + MV64XXX_I2C_REG_EXT_SLAVE_ADDR); 121 writel(MV64XXX_I2C_REG_CONTROL_TWSIEN | MV64XXX_I2C_REG_CONTROL_STOP, 122 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); 123 drv_data->state = MV64XXX_I2C_STATE_IDLE; 124 } 125 126 static void 127 mv64xxx_i2c_fsm(struct mv64xxx_i2c_data *drv_data, u32 status) 128 { 129 /* 130 * If state is idle, then this is likely the remnants of an old 131 * operation that driver has given up on or the user has killed. 132 * If so, issue the stop condition and go to idle. 133 */ 134 if (drv_data->state == MV64XXX_I2C_STATE_IDLE) { 135 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP; 136 return; 137 } 138 139 /* The status from the ctlr [mostly] tells us what to do next */ 140 switch (status) { 141 /* Start condition interrupt */ 142 case MV64XXX_I2C_STATUS_MAST_START: /* 0x08 */ 143 case MV64XXX_I2C_STATUS_MAST_REPEAT_START: /* 0x10 */ 144 drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_1; 145 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK; 146 break; 147 148 /* Performing a write */ 149 case MV64XXX_I2C_STATUS_MAST_WR_ADDR_ACK: /* 0x18 */ 150 if (drv_data->msg->flags & I2C_M_TEN) { 151 drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_2; 152 drv_data->state = 153 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK; 154 break; 155 } 156 /* FALLTHRU */ 157 case MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_ACK: /* 0xd0 */ 158 case MV64XXX_I2C_STATUS_MAST_WR_ACK: /* 0x28 */ 159 if ((drv_data->bytes_left == 0) 160 || (drv_data->aborting 161 && (drv_data->byte_posn != 0))) { 162 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP; 163 drv_data->state = MV64XXX_I2C_STATE_IDLE; 164 } else { 165 drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA; 166 drv_data->state = 167 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK; 168 drv_data->bytes_left--; 169 } 170 break; 171 172 /* Performing a read */ 173 case MV64XXX_I2C_STATUS_MAST_RD_ADDR_ACK: /* 40 */ 174 if (drv_data->msg->flags & I2C_M_TEN) { 175 drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_2; 176 drv_data->state = 177 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK; 178 break; 179 } 180 /* FALLTHRU */ 181 case MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_ACK: /* 0xe0 */ 182 if (drv_data->bytes_left == 0) { 183 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP; 184 drv_data->state = MV64XXX_I2C_STATE_IDLE; 185 break; 186 } 187 /* FALLTHRU */ 188 case MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK: /* 0x50 */ 189 if (status != MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK) 190 drv_data->action = MV64XXX_I2C_ACTION_CONTINUE; 191 else { 192 drv_data->action = MV64XXX_I2C_ACTION_RCV_DATA; 193 drv_data->bytes_left--; 194 } 195 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA; 196 197 if ((drv_data->bytes_left == 1) || drv_data->aborting) 198 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_ACK; 199 break; 200 201 case MV64XXX_I2C_STATUS_MAST_RD_DATA_NO_ACK: /* 0x58 */ 202 drv_data->action = MV64XXX_I2C_ACTION_RCV_DATA_STOP; 203 drv_data->state = MV64XXX_I2C_STATE_IDLE; 204 break; 205 206 case MV64XXX_I2C_STATUS_MAST_WR_ADDR_NO_ACK: /* 0x20 */ 207 case MV64XXX_I2C_STATUS_MAST_WR_NO_ACK: /* 30 */ 208 case MV64XXX_I2C_STATUS_MAST_RD_ADDR_NO_ACK: /* 48 */ 209 /* Doesn't seem to be a device at other end */ 210 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP; 211 drv_data->state = MV64XXX_I2C_STATE_IDLE; 212 drv_data->rc = -ENODEV; 213 break; 214 215 default: 216 dev_err(&drv_data->adapter.dev, 217 "mv64xxx_i2c_fsm: Ctlr Error -- state: 0x%x, " 218 "status: 0x%x, addr: 0x%x, flags: 0x%x\n", 219 drv_data->state, status, drv_data->msg->addr, 220 drv_data->msg->flags); 221 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP; 222 mv64xxx_i2c_hw_init(drv_data); 223 drv_data->rc = -EIO; 224 } 225 } 226 227 static void 228 mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data) 229 { 230 switch(drv_data->action) { 231 case MV64XXX_I2C_ACTION_CONTINUE: 232 writel(drv_data->cntl_bits, 233 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); 234 break; 235 236 case MV64XXX_I2C_ACTION_SEND_START: 237 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_START, 238 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); 239 break; 240 241 case MV64XXX_I2C_ACTION_SEND_ADDR_1: 242 writel(drv_data->addr1, 243 drv_data->reg_base + MV64XXX_I2C_REG_DATA); 244 writel(drv_data->cntl_bits, 245 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); 246 break; 247 248 case MV64XXX_I2C_ACTION_SEND_ADDR_2: 249 writel(drv_data->addr2, 250 drv_data->reg_base + MV64XXX_I2C_REG_DATA); 251 writel(drv_data->cntl_bits, 252 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); 253 break; 254 255 case MV64XXX_I2C_ACTION_SEND_DATA: 256 writel(drv_data->msg->buf[drv_data->byte_posn++], 257 drv_data->reg_base + MV64XXX_I2C_REG_DATA); 258 writel(drv_data->cntl_bits, 259 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); 260 break; 261 262 case MV64XXX_I2C_ACTION_RCV_DATA: 263 drv_data->msg->buf[drv_data->byte_posn++] = 264 readl(drv_data->reg_base + MV64XXX_I2C_REG_DATA); 265 writel(drv_data->cntl_bits, 266 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); 267 break; 268 269 case MV64XXX_I2C_ACTION_RCV_DATA_STOP: 270 drv_data->msg->buf[drv_data->byte_posn++] = 271 readl(drv_data->reg_base + MV64XXX_I2C_REG_DATA); 272 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN; 273 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP, 274 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); 275 drv_data->block = 0; 276 wake_up_interruptible(&drv_data->waitq); 277 break; 278 279 case MV64XXX_I2C_ACTION_INVALID: 280 default: 281 dev_err(&drv_data->adapter.dev, 282 "mv64xxx_i2c_do_action: Invalid action: %d\n", 283 drv_data->action); 284 drv_data->rc = -EIO; 285 /* FALLTHRU */ 286 case MV64XXX_I2C_ACTION_SEND_STOP: 287 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN; 288 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP, 289 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL); 290 drv_data->block = 0; 291 wake_up_interruptible(&drv_data->waitq); 292 break; 293 } 294 } 295 296 static int 297 mv64xxx_i2c_intr(int irq, void *dev_id) 298 { 299 struct mv64xxx_i2c_data *drv_data = dev_id; 300 unsigned long flags; 301 u32 status; 302 int rc = IRQ_NONE; 303 304 spin_lock_irqsave(&drv_data->lock, flags); 305 while (readl(drv_data->reg_base + MV64XXX_I2C_REG_CONTROL) & 306 MV64XXX_I2C_REG_CONTROL_IFLG) { 307 status = readl(drv_data->reg_base + MV64XXX_I2C_REG_STATUS); 308 mv64xxx_i2c_fsm(drv_data, status); 309 mv64xxx_i2c_do_action(drv_data); 310 rc = IRQ_HANDLED; 311 } 312 spin_unlock_irqrestore(&drv_data->lock, flags); 313 314 return rc; 315 } 316 317 /* 318 ***************************************************************************** 319 * 320 * I2C Msg Execution Routines 321 * 322 ***************************************************************************** 323 */ 324 static void 325 mv64xxx_i2c_prepare_for_io(struct mv64xxx_i2c_data *drv_data, 326 struct i2c_msg *msg) 327 { 328 u32 dir = 0; 329 330 drv_data->msg = msg; 331 drv_data->byte_posn = 0; 332 drv_data->bytes_left = msg->len; 333 drv_data->aborting = 0; 334 drv_data->rc = 0; 335 drv_data->cntl_bits = MV64XXX_I2C_REG_CONTROL_ACK | 336 MV64XXX_I2C_REG_CONTROL_INTEN | MV64XXX_I2C_REG_CONTROL_TWSIEN; 337 338 if (msg->flags & I2C_M_RD) 339 dir = 1; 340 341 if (msg->flags & I2C_M_REV_DIR_ADDR) 342 dir ^= 1; 343 344 if (msg->flags & I2C_M_TEN) { 345 drv_data->addr1 = 0xf0 | (((u32)msg->addr & 0x300) >> 7) | dir; 346 drv_data->addr2 = (u32)msg->addr & 0xff; 347 } else { 348 drv_data->addr1 = ((u32)msg->addr & 0x7f) << 1 | dir; 349 drv_data->addr2 = 0; 350 } 351 } 352 353 static void 354 mv64xxx_i2c_wait_for_completion(struct mv64xxx_i2c_data *drv_data) 355 { 356 long time_left; 357 unsigned long flags; 358 char abort = 0; 359 360 time_left = wait_event_interruptible_timeout(drv_data->waitq, 361 !drv_data->block, msecs_to_jiffies(drv_data->adapter.timeout)); 362 363 spin_lock_irqsave(&drv_data->lock, flags); 364 if (!time_left) { /* Timed out */ 365 drv_data->rc = -ETIMEDOUT; 366 abort = 1; 367 } else if (time_left < 0) { /* Interrupted/Error */ 368 drv_data->rc = time_left; /* errno value */ 369 abort = 1; 370 } 371 372 if (abort && drv_data->block) { 373 drv_data->aborting = 1; 374 spin_unlock_irqrestore(&drv_data->lock, flags); 375 376 time_left = wait_event_timeout(drv_data->waitq, 377 !drv_data->block, 378 msecs_to_jiffies(drv_data->adapter.timeout)); 379 380 if ((time_left <= 0) && drv_data->block) { 381 drv_data->state = MV64XXX_I2C_STATE_IDLE; 382 dev_err(&drv_data->adapter.dev, 383 "mv64xxx: I2C bus locked, block: %d, " 384 "time_left: %d\n", drv_data->block, 385 (int)time_left); 386 mv64xxx_i2c_hw_init(drv_data); 387 } 388 } else 389 spin_unlock_irqrestore(&drv_data->lock, flags); 390 } 391 392 static int 393 mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg) 394 { 395 unsigned long flags; 396 397 spin_lock_irqsave(&drv_data->lock, flags); 398 mv64xxx_i2c_prepare_for_io(drv_data, msg); 399 400 if (unlikely(msg->flags & I2C_M_NOSTART)) { /* Skip start/addr phases */ 401 if (drv_data->msg->flags & I2C_M_RD) { 402 /* No action to do, wait for slave to send a byte */ 403 drv_data->action = MV64XXX_I2C_ACTION_CONTINUE; 404 drv_data->state = 405 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA; 406 } else { 407 drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA; 408 drv_data->state = 409 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK; 410 drv_data->bytes_left--; 411 } 412 } else { 413 drv_data->action = MV64XXX_I2C_ACTION_SEND_START; 414 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_START_COND; 415 } 416 417 drv_data->block = 1; 418 mv64xxx_i2c_do_action(drv_data); 419 spin_unlock_irqrestore(&drv_data->lock, flags); 420 421 mv64xxx_i2c_wait_for_completion(drv_data); 422 return drv_data->rc; 423 } 424 425 /* 426 ***************************************************************************** 427 * 428 * I2C Core Support Routines (Interface to higher level I2C code) 429 * 430 ***************************************************************************** 431 */ 432 static u32 433 mv64xxx_i2c_functionality(struct i2c_adapter *adap) 434 { 435 return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL; 436 } 437 438 static int 439 mv64xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) 440 { 441 struct mv64xxx_i2c_data *drv_data = i2c_get_adapdata(adap); 442 int i, rc; 443 444 for (i=0; i<num; i++) 445 if ((rc = mv64xxx_i2c_execute_msg(drv_data, &msgs[i])) < 0) 446 return rc; 447 448 return num; 449 } 450 451 static const struct i2c_algorithm mv64xxx_i2c_algo = { 452 .master_xfer = mv64xxx_i2c_xfer, 453 .functionality = mv64xxx_i2c_functionality, 454 }; 455 456 /* 457 ***************************************************************************** 458 * 459 * Driver Interface & Early Init Routines 460 * 461 ***************************************************************************** 462 */ 463 static int __devinit 464 mv64xxx_i2c_map_regs(struct platform_device *pd, 465 struct mv64xxx_i2c_data *drv_data) 466 { 467 int size; 468 struct resource *r = platform_get_resource(pd, IORESOURCE_MEM, 0); 469 470 if (!r) 471 return -ENODEV; 472 473 size = r->end - r->start + 1; 474 475 if (!request_mem_region(r->start, size, drv_data->adapter.name)) 476 return -EBUSY; 477 478 drv_data->reg_base = ioremap(r->start, size); 479 drv_data->reg_base_p = r->start; 480 drv_data->reg_size = size; 481 482 return 0; 483 } 484 485 static void __devexit 486 mv64xxx_i2c_unmap_regs(struct mv64xxx_i2c_data *drv_data) 487 { 488 if (drv_data->reg_base) { 489 iounmap(drv_data->reg_base); 490 release_mem_region(drv_data->reg_base_p, drv_data->reg_size); 491 } 492 493 drv_data->reg_base = NULL; 494 drv_data->reg_base_p = 0; 495 } 496 497 static int __devinit 498 mv64xxx_i2c_probe(struct platform_device *pd) 499 { 500 struct mv64xxx_i2c_data *drv_data; 501 struct mv64xxx_i2c_pdata *pdata = pd->dev.platform_data; 502 int rc; 503 504 if ((pd->id != 0) || !pdata) 505 return -ENODEV; 506 507 drv_data = kzalloc(sizeof(struct mv64xxx_i2c_data), GFP_KERNEL); 508 if (!drv_data) 509 return -ENOMEM; 510 511 if (mv64xxx_i2c_map_regs(pd, drv_data)) { 512 rc = -ENODEV; 513 goto exit_kfree; 514 } 515 516 strlcpy(drv_data->adapter.name, MV64XXX_I2C_CTLR_NAME " adapter", 517 sizeof(drv_data->adapter.name)); 518 519 init_waitqueue_head(&drv_data->waitq); 520 spin_lock_init(&drv_data->lock); 521 522 drv_data->freq_m = pdata->freq_m; 523 drv_data->freq_n = pdata->freq_n; 524 drv_data->irq = platform_get_irq(pd, 0); 525 if (drv_data->irq < 0) { 526 rc = -ENXIO; 527 goto exit_unmap_regs; 528 } 529 drv_data->adapter.dev.parent = &pd->dev; 530 drv_data->adapter.id = I2C_HW_MV64XXX; 531 drv_data->adapter.algo = &mv64xxx_i2c_algo; 532 drv_data->adapter.owner = THIS_MODULE; 533 drv_data->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD; 534 drv_data->adapter.timeout = pdata->timeout; 535 drv_data->adapter.nr = pd->id; 536 platform_set_drvdata(pd, drv_data); 537 i2c_set_adapdata(&drv_data->adapter, drv_data); 538 539 mv64xxx_i2c_hw_init(drv_data); 540 541 if (request_irq(drv_data->irq, mv64xxx_i2c_intr, 0, 542 MV64XXX_I2C_CTLR_NAME, drv_data)) { 543 dev_err(&drv_data->adapter.dev, 544 "mv64xxx: Can't register intr handler irq: %d\n", 545 drv_data->irq); 546 rc = -EINVAL; 547 goto exit_unmap_regs; 548 } else if ((rc = i2c_add_numbered_adapter(&drv_data->adapter)) != 0) { 549 dev_err(&drv_data->adapter.dev, 550 "mv64xxx: Can't add i2c adapter, rc: %d\n", -rc); 551 goto exit_free_irq; 552 } 553 554 return 0; 555 556 exit_free_irq: 557 free_irq(drv_data->irq, drv_data); 558 exit_unmap_regs: 559 mv64xxx_i2c_unmap_regs(drv_data); 560 exit_kfree: 561 kfree(drv_data); 562 return rc; 563 } 564 565 static int __devexit 566 mv64xxx_i2c_remove(struct platform_device *dev) 567 { 568 struct mv64xxx_i2c_data *drv_data = platform_get_drvdata(dev); 569 int rc; 570 571 rc = i2c_del_adapter(&drv_data->adapter); 572 free_irq(drv_data->irq, drv_data); 573 mv64xxx_i2c_unmap_regs(drv_data); 574 kfree(drv_data); 575 576 return rc; 577 } 578 579 static struct platform_driver mv64xxx_i2c_driver = { 580 .probe = mv64xxx_i2c_probe, 581 .remove = mv64xxx_i2c_remove, 582 .driver = { 583 .owner = THIS_MODULE, 584 .name = MV64XXX_I2C_CTLR_NAME, 585 }, 586 }; 587 588 static int __init 589 mv64xxx_i2c_init(void) 590 { 591 return platform_driver_register(&mv64xxx_i2c_driver); 592 } 593 594 static void __exit 595 mv64xxx_i2c_exit(void) 596 { 597 platform_driver_unregister(&mv64xxx_i2c_driver); 598 } 599 600 module_init(mv64xxx_i2c_init); 601 module_exit(mv64xxx_i2c_exit); 602 603 MODULE_AUTHOR("Mark A. Greer <mgreer@mvista.com>"); 604 MODULE_DESCRIPTION("Marvell mv64xxx host bridge i2c ctlr driver"); 605 MODULE_LICENSE("GPL"); 606